/// 正規化キューブマップの生成
public static TextureCube CreateNormalizeCubeTexture(int width)
{
int height = width;
TextureCube nc = new TextureCube(width, false, PixelFormat.Rgba);
nc.SetFilter(TextureFilterMode.Linear,
TextureFilterMode.Linear,
TextureFilterMode.Linear);
nc.SetWrap(TextureWrapMode.ClampToEdge, TextureWrapMode.ClampToEdge);
// +X
{
byte[] pixsPX = new byte[width * height * 4];
byte[] pixsNX = new byte[width * height * 4];
byte[] pixsPY = new byte[width * height * 4];
byte[] pixsNY = new byte[width * height * 4];
byte[] pixsPZ = new byte[width * height * 4];
byte[] pixsNZ = new byte[width * height * 4];
for (int v = 0; v < width; v++)
{
float y = (float)(v + v - height) / (float)height;
for (int u = 0; u < width; u++)
{
float x = (float)(u + u - width) / (float)width;
float r = 1.0f / (float)Math.Sqrt((x * x) + (y * y) + 1.0f);
float s = x * r;
float t = y * r;
Vector3 vn = new Vector3(r, s, t);
vn = vn.Normalize();
r = (r / 2.0f + 0.5f);
s = (s / 2.0f + 0.5f);
t = (t / 2.0f + 0.5f);
int ofst = (4 * u) + ((v * 4) * width);
pixsPX[ofst + 0] = (byte)(255 * r);
pixsPX[ofst + 1] = (byte)(255 * -t);
pixsPX[ofst + 2] = (byte)(255 * -s);
pixsPX[ofst + 3] = 0xFF;
pixsNX[ofst + 0] = (byte)(255 * -r);
pixsNX[ofst + 1] = (byte)(255 * -t);
pixsNX[ofst + 2] = (byte)(255 * s);
pixsNX[ofst + 3] = 0xFF;
pixsPY[ofst + 0] = (byte)(255 * s);
pixsPY[ofst + 1] = (byte)(255 * r);
pixsPY[ofst + 2] = (byte)(255 * t);
pixsPY[ofst + 3] = 0xFF;
pixsNY[ofst + 0] = (byte)(255 * s);
pixsNY[ofst + 1] = (byte)(255 * -r);
pixsNY[ofst + 2] = (byte)(255 * -t);
pixsNY[ofst + 3] = 0xFF;
pixsPZ[ofst + 0] = (byte)(255 * s);
pixsPZ[ofst + 1] = (byte)(255 * -t);
pixsPZ[ofst + 2] = (byte)(255 * r);
pixsPZ[ofst + 3] = 0xFF;
pixsNZ[ofst + 0] = (byte)(255 * -s);
pixsNZ[ofst + 1] = (byte)(255 * -t);
pixsNZ[ofst + 2] = (byte)(255 * -r);
pixsNZ[ofst + 3] = 0xFF;
}
}
nc.SetPixels(0, TextureCubeFace.PositiveX, pixsPX);
nc.SetPixels(0, TextureCubeFace.NegativeX, pixsNX);
nc.SetPixels(0, TextureCubeFace.PositiveY, pixsPY);
nc.SetPixels(0, TextureCubeFace.NegativeY, pixsNY);
nc.SetPixels(0, TextureCubeFace.PositiveZ, pixsPZ);
nc.SetPixels(0, TextureCubeFace.NegativeZ, pixsNZ);
}
return(nc);
}
/// 正規化キューブマップの生成
public static TextureCube CreateNormalizeCubeTexture( int width )
{
int height = width;
TextureCube nc = new TextureCube( width, false, PixelFormat.Rgba );
nc.SetFilter( TextureFilterMode.Linear,
TextureFilterMode.Linear,
TextureFilterMode.Linear );
nc.SetWrap( TextureWrapMode.ClampToEdge, TextureWrapMode.ClampToEdge );
// +X
{
byte[] pixsPX = new byte[ width * height * 4 ];
byte[] pixsNX = new byte[ width * height * 4 ];
byte[] pixsPY = new byte[ width * height * 4 ];
byte[] pixsNY = new byte[ width * height * 4 ];
byte[] pixsPZ = new byte[ width * height * 4 ];
byte[] pixsNZ = new byte[ width * height * 4 ];
for( int v = 0; v < width; v++ ){
float y = (float)(v + v - height) / (float)height;
for( int u = 0; u < width; u++ ){
float x = (float)(u + u - width) / (float)width;
float r = 1.0f / (float)Math.Sqrt( (x * x) + (y * y) + 1.0f);
float s = x * r;
float t = y * r;
Vector3 vn = new Vector3( r, s, t );
vn = vn.Normalize();
r = (r / 2.0f + 0.5f);
s = (s / 2.0f + 0.5f);
t = (t / 2.0f + 0.5f);
int ofst = (4 * u) + ((v * 4) * width);
pixsPX[ ofst + 0 ] = (byte)(255 * r);
pixsPX[ ofst + 1 ] = (byte)(255 * -t);
pixsPX[ ofst + 2 ] = (byte)(255 * -s);
pixsPX[ ofst + 3 ] = 0xFF;
pixsNX[ ofst + 0 ] = (byte)(255 * -r);
pixsNX[ ofst + 1 ] = (byte)(255 * -t);
pixsNX[ ofst + 2 ] = (byte)(255 * s);
pixsNX[ ofst + 3 ] = 0xFF;
pixsPY[ ofst + 0 ] = (byte)(255 * s);
pixsPY[ ofst + 1 ] = (byte)(255 * r);
pixsPY[ ofst + 2 ] = (byte)(255 * t);
pixsPY[ ofst + 3 ] = 0xFF;
pixsNY[ ofst + 0 ] = (byte)(255 * s);
pixsNY[ ofst + 1 ] = (byte)(255 * -r);
pixsNY[ ofst + 2 ] = (byte)(255 * -t);
pixsNY[ ofst + 3 ] = 0xFF;
pixsPZ[ ofst + 0 ] = (byte)(255 * s);
pixsPZ[ ofst + 1 ] = (byte)(255 * -t);
pixsPZ[ ofst + 2 ] = (byte)(255 * r);
pixsPZ[ ofst + 3 ] = 0xFF;
pixsNZ[ ofst + 0 ] = (byte)(255 * -s);
pixsNZ[ ofst + 1 ] = (byte)(255 * -t);
pixsNZ[ ofst + 2 ] = (byte)(255 * -r);
pixsNZ[ ofst + 3 ] = 0xFF;
}
}
nc.SetPixels( 0, TextureCubeFace.PositiveX, pixsPX );
nc.SetPixels( 0, TextureCubeFace.NegativeX, pixsNX );
nc.SetPixels( 0, TextureCubeFace.PositiveY, pixsPY );
nc.SetPixels( 0, TextureCubeFace.NegativeY, pixsNY );
nc.SetPixels( 0, TextureCubeFace.PositiveZ, pixsPZ );
nc.SetPixels( 0, TextureCubeFace.NegativeZ, pixsNZ );
}
return nc;
}